research centers


Search results: Found 2

Listing 1 - 2 of 2
Sort by

Article
Impact of Sorts Disinfection and Cleansing Material on Hardness of Different Types of Denture Base Material

Author: Reem Ahmed Shihab ريم احمد شهاب
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2017 Volume: 5 Issue: 1 Pages: 135-142
Publisher: Tikrit University جامعة تكريت

Loading...
Loading...
Abstract

Dentist, dental technician and assistants are faced a several kinds of microorganisms during worklike bacteria, fungi and viruses .So, we can prevent cross contamination by using either chemicalor mechanical disinfection. The aim of the research was to measure the effect of different typesof chemical disinfection on the hardness of two types of denture base resin, heat activated acrylicand nylon (flexible). A total number of 80 denture resin specimens (40 specimens from heatactivated acrylic and 40 specimens from flexible resin) were prepared. Each type of specimenwas subdivided into 4 groups. Three groups were divided according to the type of denturedisinfectants (1%sodium hypochlorite, 1% povidine/iodine, Kin solution) and the fourth whichconsidered as control group was immersed in distilled water. All specimens were immersed intesting solution for 90 minutes at 370C. The hardness of the specimens before and afterimmersion was tested using Shore D machine. Our study showed that the mean value ofhardness test for poly methyl methacrylate higher than polyamide and there need aid nonsignificantContrast in the resistance of the surface to scratches and indentation between diversesorts of thermoplastic resin after using chemical disinfectant and denture cleansers withcomparison with control group for each type of denture base resin. The resistance to indentationof different types of denture base would not affected by short time immersion in chemical

Keywords

Ceramic laser --- Bonding.


Article
Effect of certain chemical surface treatments on repair bond strength of some denture base materials

Authors: Reem Ahmed Shihab ريم احمد شهاب --- Basima M. A. Hussein باسمة حسين
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 1 Pages: 53-58
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Fracture of different types of acrylic denture base is a common problem associated with dental prosthesis. Studies suggested that the repair strength may be improved by several means including surface treatment with chemical agents. The aim of the study was to evaluate the effect of surface treatment with acrybond-bonding agent and monomer on fractured denture base in respect to transverse, tensile and shear bond strength and evaluation of the mode of failure by light microscope. Materials and methods: Two hundred seventy specimens were prepared and divided into 3 groups according to thematerial used (regular conventional, rapid simplified and high impact) heat cure acrylic. The specimen in each groups were prepared specifically according to testing (tensile, transverse and shear bond strength). All the specimens were stored in 37°C for 28days before fracture then the specimens in each test were divided into 3 groups according to surface treatment (control-without surface treatment, monomer(MMA) group and acrybond (MMA with acetone ))group. The specimens repaired with cold cure acrylic using Ivomet; then stored in distill water at 37°C for 2days before testing. GEFRA universal testing machine was used and final load at fracture was recorded. Results: monomer and acrybond group exhibited higher bond strength than control group. Conclusion: the type of denture base affect the value of bond strength and the use of monomer or acrybond resulted in higher bond strength than untreated surface

Listing 1 - 2 of 2
Sort by
Narrow your search

Resource type

article (2)


Language

English (2)


Year
From To Submit

2017 (1)

2014 (1)